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sdf/expr

src/sdf/expr.tur

SdfExpr tagged-union AST for signed distance fields.

Since: Phase 1

defn

sdf--make-leaf

(sdf--make-leaf [tag :int v0x :float v0y :float v0z :float v1x :float v1y :float v1z :float s0 :float s1 :float] :int)

allocate a leaf SdfExpr (no children).

Parameters
tagSDF_* tag constant
v0x v0y v0z -- first vec3 slot (center / lo corner)
v1x v1y v1z -- second vec3 slot (direction / hi corner)
s0primary scalar (radius / distance)
s1secondary scalar (unused in Phase 1)
Returns

Opaque :int handle to heap-allocated sdf_node.

Example
(sdf--make-leaf SDF_SPHERE 0.0 0.0 0.0  0.0 0.0 0.0  1.0 0.0)

Since: Phase 1

defn

sdf--make-node

(sdf--make-node [tag :int left :int right :int s0 :float s1 :float] :int)

allocate a binary interior SdfExpr node.

Parameters
tagSDF_* tag for this combinator
leftleft child handle
rightright child handle
s0 s1 -- optional scalars (blend-k for smooth union, etc.)
Returns

Opaque :int handle to heap-allocated sdf_node.

Since: Phase 1

defn

sdf--make-unary

(sdf--make-unary [tag :int child :int s0 :float s1 :float] :int)

allocate a unary interior SdfExpr node.

Parameters
tagSDF_* tag for this modifier
childchild handle (stored in left; right is NULL)
s0 s1 -- optional scalars (offset distance, shell thickness, etc.)
Returns

Opaque :int handle to heap-allocated sdf_node.

Since: Phase 1

defn

sdf-tag

(sdf-tag [e :int] :int)

read the tag field of an SdfExpr. Since: Phase 1

defn

sdf-left

(sdf-left [e :int] :int)

left child handle (0 for leaves). Since: Phase 1

defn

sdf-right

(sdf-right [e :int] :int)

right child handle (0 for leaves and unaries). Since: Phase 1

defn

sdf-v0x

(sdf-v0x [e :int] :float)

v0.x component. Since: Phase 1

defn

sdf-v0y

(sdf-v0y [e :int] :float)

v0.y component. Since: Phase 1

defn

sdf-v0z

(sdf-v0z [e :int] :float)

v0.z component. Since: Phase 1

defn

sdf-v1x

(sdf-v1x [e :int] :float)

v1.x component. Since: Phase 1

defn

sdf-v1y

(sdf-v1y [e :int] :float)

v1.y component. Since: Phase 1

defn

sdf-v1z

(sdf-v1z [e :int] :float)

v1.z component. Since: Phase 1

defn

sdf-s0

(sdf-s0 [e :int] :float)

primary scalar (radius, blend-k, offset, etc.). Since: Phase 1

defn

sdf-s1

(sdf-s1 [e :int] :float)

secondary scalar. Since: Phase 1

defn

sdf-free

(sdf-free [e :int] :void)

recursively free an SdfExpr tree.

Parameters
eSdfExpr handle; safe to call with 0 (no-op).
Example
(sdf-free scene)

Since: Phase 1